Update data according to another table

Hi,
 
I would like to update data in a table according to another table.
Concretely, the data are to be updated if they are different in the other table.
 
Here is a part of my procedure :

UPDATE GLMASTER_SAVE

SET GLMASTER_SAVE.ACTIVE_STATUS = GLMASTER.ACTIVE_STATUS
WHERE GLMASTER_SAVE.COMPANY = GLMASTER.COMPANY
 AND GLMASTER_SAVE.ACCT_UNIT = GLMASTER.ACCT_UNIT
 AND GLMASTER_SAVE.ACCOUNT = GLMASTER.ACCOUNT
 AND GLMASTER_SAVE.SUB_ACCOUNT = GLMASTER.SUB_ACCOUNT
 AND GLMASTER_SAVE.ACTIVE_STATUS <> GLMASTER.ACTIVE_STATUS;
 
The data (field ACTIVE_STATUS) are to be updated in the table GLMASTER_SAVE if the same field is different in the table GLMASTER.
 
Thank you for your help.
 

Patrick

UPDATE GLMASTER_SAVE
SET GLMASTER_SAVE.ACTIVE_STATUS =
(SELECT GLMASTER.ACTIVE_STATUS
FROM GLMASTER
WHERE GLMASTER_SAVE.COMPANY = GLMASTER.COMPANY
 AND GLMASTER_SAVE.ACCT_UNIT = GLMASTER.ACCT_UNIT
 AND GLMASTER_SAVE.ACCOUNT = GLMASTER.ACCOUNT
 AND GLMASTER_SAVE.SUB_ACCOUNT = GLMASTER.SUB_ACCOUNT
 AND GLMASTER_SAVE.ACTIVE_STATUS <> GLMASTER.ACTIVE_STATUS)
WHERE EXISTS
(select 1 from glmaster
WHERE GLMASTER_SAVE.COMPANY = GLMASTER.COMPANY
 AND GLMASTER_SAVE.ACCT_UNIT = GLMASTER.ACCT_UNIT
 AND GLMASTER_SAVE.ACCOUNT = GLMASTER.ACCOUNT
 AND GLMASTER_SAVE.SUB_ACCOUNT = GLMASTER.SUB_ACCOUNT
 AND GLMASTER_SAVE.ACTIVE_STATUS <> GLMASTER.ACTIVE_STATUS);
Regards
Dmytro Dekhtyaryuk

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users who are online etc. from the moment a user is
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